You should point out that unlike String.fromCharCode( asciiNumVal ), stringInstance.charCodeAt( index ) is not a static method of class String
–
boboboboSep 12 '12 at 19:09

11

@Mathias Bynens, It certainly does default to zero but I just ran a just out of interest test on performance and it performs **relatively badly compared using 0. jsperf.com/default-to-0-vs-0/4 ** Its a relative difference only, either way its very very quick.
–
wade montagueMay 9 '13 at 12:35